Coal-drill.



W. H. CLARKSON. COAL DRILL. APPLIOATION FILED MAR. 1s, 1908.

Patented Jan. 7', 1913.

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GOAL DRILL.

APPLIQATION FILED 1111111.16, 190e.

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W. H. CLARKSON. GOAL DRILL.

APPLICATION FILED MAR. 16, 1908.

Patented Jan. 7, 1913.

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WILLIAM II. CLAEKSON, OF EDWARDS STATION, ILLINOIS.

COAL-DRILL.

Specification of Letters Patent.

Patented J an. '7, 1913.

Application filed March 16, 1908. Serial No. 421,342.

T 0 alt fte/0m t may concern.'

Be it known that I, WM. IICLARnsoN, a citizen of the United States,residing at Edwards Station, in the county of Peoria and State ofIllinois, have invented certain new and usci-'ul Improvements in Coal-Drills; and I do hereby declare that the tollowing is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same.

This invention pertains to coal drills and relates more particularly toa renewable boxing or feed nut for the same, and an interchangeablethread-bar driving device.

The primary object is to provide a simple boxing that can be detachedfrom the other parts of the machine and renewed at a very small expensewhen rendered unfit for further service.

A further object is to provide mechanism in a coal drill consisting` oi.several parts which can be readily assembled or taken apart forconvenience and also that in renewing a part that may have been renderedunfit for further use, it may be replaced by another without thenecessity of discarding the greater portion of the machine as is oftenthe case.

In addition to the above the invention relates to certain details ofconstruction as will be pointed out hereinafter and also made toconstitute part of the claims.

It is well known that the boxing or feed nut when its threads becomeconsiderably worn must be replaced by a new one and, it is my purpose toconstruct a boxing simple in form and of light weight so that it may bereplaced at a minimum of cost, and it is a further purpose to make saidboxing interchangeable with the other parts of the drill mechanism sothat no fitting is necessary in replacing the worn part. My constructionis suoli, also, that it provides 'for the ready opening of the boxingfor adjust ment of the thread-bar to its work.

In the drawing forming part of this application, Figure 1 is a plan ofthe boxing` as I construct it. Fig. 2 is a plan of a portion with whichit engages. Fig. 3 is a longitudinal section of a. beveled gear. Fig.4lis a side elevation of the assembled parts shown in lirst threefigures and showing, also, a portion of a supporting frame. Fig. 5 is arear elevation of the same. Fig. G is a perspective view ot' a lockingdevice for the boxing.. Fig. 7 is a side elevation ot' the boxing'asviewed in Fig. L11. Fig. 8 is a side elevation of the member shown inFig. 2 which receives the boxing in Fig. 7. Fig. 9 is a vertical crosssection of the boxing and its locking member on line a a, Fig. 1. Fig.10 is a side elevation of a modiiied form of the boxing support shown inFig. 8. Fig. 11 is a transverse section of Fig. 10, taken on lines Z) o.Fig. 11 is a longitudinal section of the gear shown in F 10'. Fig. 12 isa plan of a portion of the boxing and support, drawn on a much largerscale, showing a latch. Fig. 13 shows a crank and certain parts withwhich it engages. Fig. 14: shows the crank in ra different position. F15 is a vertical longitudinal section of a driving pinion and a stud forcarrying it, the crank being shown in connection therewith. Fig. 16 is aperspective view of a litting which carries the crank. Fig. 17 is a planof the complete device of the form shown in Figs. 11 to 16.

The boxing or feed-nut comprises an upper and a lower portion A and Brespectively, hinged at C in the usual manner, the lower member havinghorizontal extensions or trunnions D by which it is supported in theframe members E, all of which is well known. Saidv lower member at theside opposite the hinge has an extension F provided with verticallydisposed lugs G one ci' which is drilled to receive the end of the camH, the other being slotted as shown at J in Fig. 5 to receive the end ofthe cam which is slipped thereinto, said cam being positionedsubstantially as shown in Figs. 1, et and 7. A split pin J or othersuitable device is inserted in the lug vertically across the slot andadjacent to the cam whereby that member is positively held in place. Theupper boxing section A has an extension K which lies upon the extensionF of the lower section and which receives pressure 'from the said camI-I as indicated in Fig. 9. In Fig. 1 the cam is thrown to the openposition so that the upper section can be raised on its hinge but inFig. 9 the cam is shown in its position to firmly lock the sectionstogether. The said extension K, as shown in the ligure last referred tois gradually thickened to ward the edge so that when the cam is turnedupon it the two serve to form a substantial. and positive lock. However,the structure oli.

the cam is such that whether or not the part K is thickened asdescribed, the locking action will result.

It is observed that the ends of the cam as carried in the bearings G areeccentric to the body portion of said cam, that is to say, the axes ofsaid ends are not coincident with the central axis of the body. Now,evidently if the part K were even Hat and sufficiently extended beneaththe axes of the ends, while still able to clear the cam portion in thelifting movement of the boxing portion A, the said cam portion whenswung to a position where it would be substantially beneath the axis ofits ends it would naturally not only continually'increase in itspressure upon the part K, but would finally reach a position where itwould remain locked in place since the line of greatest eccentricity iscarried nearer and nearer to a line extending through the axes of theends and the point of contact of the cam and the said part K andpressure reacting upon the cam would not be sufficient to turn it in abackward direction.

Figs. 2, 4 and 8 show a member N which serves as a bearing for thesleeve L of the Y driving gear M shown in Fig. 3 and serves also toproperly hold said gear with relation to the boxing. This member has aforward extension O grooved at O to receive the said sleeve L and hasasecond groove at P to receive an annular flange Q on said sleeve L.Still another groove at R receives the curved under side of the lowerboxing section B there being rearward extensions or overhanging lugs atS, Fig. 4, beneath which the said lower boxing section extends as shownin said Fig. 4. A rearward extension T extends through an aperture U ina depending lug V at the rear end of the boxing and a transverse slot Win the extremity of said extension T receives a wedge l which, forconvenience, is attached to a part of the boxing as, for instance, bymeans of a chain 2 or other suitable means. It will be noted that asassembled in Fig. 4 the wedge is inserted in the hole W aftertheextension T has been passed through the said lug V. The wedge whensnugly driven home serves to draw the member N and the boxing into firmengagement.

Upon the top of the boxing section A is an overhanging hook 3 adapted toengage the flange Q of the sleeve L. This member rmly holds the gear inposition but permits it to freely revolve. The thread-bar indi cated at4, is provided with a groove or spline 5 and a feather 6 wit-hin thegear and its sleeve L engages it. The boxing B is threaded to receivesaid thread-bar and the latter is fed to its work in the customarymanner, the feather 6 of the gearing serving to impart motion to thesaid thread bar, the latter moving through said gear as it performs itswork.

Vhen desired to change the position of the thread-bar with respect tothe boxing, the cam H is moved to release the section A which is raisedupon its hinge. rhis releases the bar and the gear both of which may belifted out of their places. The bar is then shifted through the gear Mto the desired position and the section A closed and locked. It may bestated, however, that the overhanging hook 3 of the section A need notbe used necessarily since the thread bar by being firmly held by theboxing will itself firmly hold the sleeve L within its seat.

The simple construction of the boxing, which is made up entirely ofcastings,and merely threaded, is of low cost and when worn out can bediscarded and in a moment or two a duplicate boxing can be placed inposition and the cam in the discarded boxing can be removed bywithdrawing the pin J and placed in the new one.

lVhen releasing the thread bar as above described the parts are all freefrom one another except the boxing' and the member N which are heldrelatively rigid by t-he wedge and the interlocking lugs S. The saidmember N is provided with a stud 7 at one side which carries a pinion 8to mesh with the gear M, the pinion and gear beingshown in juxtapositionin Fig. 5. Preferably the pinion, besides being bored to slip upc-n thestud, is counterbored at 9 and a collar l() enters such counterbore topass over the end of the stud, said collar being held in place by a pin1l which extends through the stud behind it. The pin is no longer thanthe outer diameter of the c0llar so that the pinion may readily turnwithout interference therefrom, there being an aperture in the pinion at12 through which the pin may be entered and withdrawn. Said pinion hasan extension *outside of the end of the stud and is provided with anopening 13 at diametrically opposite sides through which a handle 14 ispassed to constitute a crank by which to impart motion to the thread-barthrough the gear M as will be understood. The pinion is employed whenthe drill is being used in cramped positions and when desired the handlemay be removed and placed upon the rear end of the thread bar in therear of the machine, all of which is well understood.

It is evident that it is not necessary to be confined to theexactconstruction shown herein nor the particular manner of interlockingthe various members since other ways may be adopted that will comewithin the spirit and intent of the invention.

F ig. 10 shows a modified form of the member N which, in the presentcase, is indicated by the numeral l5. This has an upper and lowerextension 1G instead of but one, and is tubular in form, consistingpref-V erably of a single casting as before. The

gear 17 corresponding with M in the other igures has .the sleeve 18without the fixed flange at its end. In lieu ot' said flange the end isprovided with screw threads 20 as shown in Fig. 12, which is thepreferredl form, and after said sleeve has been inserted into the member15 two rings 21 and 22 are separately inserted between the extensions 16and placed in posit-ion upon the said sleeve, the ring 22 bearingagainst a shoulder' 28 of said member 15 as shown in Fig. 12 andanswering in the same capacity as the fixed flange Q; just mentioned,followed by the ring 21 which constitutes a lock-nut. Said rings areprovided with holes 2a by which they may be adjusted upon the sleeve,using for the purpose a Spanner-wrench7 which, however, has not beenshown as it is well understood, said wrench being inserted between thesaid extensions 16 in order to reach said rings. On the boxing are lugs25 against which the ends of the extensions 16 are adapted to abut. Eachlug 25 has a beveled face 27 with each of which a latch 26 engages whenthe boxing is seated in place in the manner shown. rihese latches 26 arepivoted on the member 16 and swing behind the lugs causing the boxingand the said member 16 to be drawn firmly together. As may be seen, saidlatches are provided with bends so as to pass over the tops of the lugs,By providing an upper and a lower rigid arm between which to slip theboxing a very rigid connection is assured.

The pinion is indicated in Fig. 15 by the number 28 and its hub in thiscase is irregular in cross sectional form and is indicated at 29 thisbeing bored to slip upon the stud 30. The stud in this instance, asshown in Fig. 15, is provided with an annular groove 31 and the end ofthe hub 29 lies flush with and terminates at said groove. In Fig. 16 isa member 32 having a socket 33 adapted to iit upon the said hub. Thismember has a right angled extension 341 provided with a transverse slot35 extending substantially parallel to the pla-ne of revolution of thepinion. n this slot is iittcd a bar or arm 36, said arm being providedwith a handle 37 to constitute a crank and near the handle 37 is a notch38. When the notch is within the slot 8S the member 32 can be slippedupon the hub 29 to its working position so as to bring the arm 36 inline with the annular groove 31 ot the stud. lThe arm may now be shiftedto draw its edge into the groove. This will hold the member 32 in placeand the hub of the pinion bears upon the arm and the pinion is therebyheld in positive engagement with the driving gear. As the arm is turnedto impart movement to the pinion it travels within the said annulargroove. This construction is simple and effective and the arm can beshifted in the direction ot its lengthV so-as to have more or lesssweep, giving the operator any desired leverage. For convenience, a pin39 in the end of the arm prevents it being withdrawn from the slot 35and prevents separation of the member 32 and said arm when detached fromthe machine.

Having thus described my invention, claim: Y j

1. 1n a coal drill the combination with an internally threaded boxingand a threadbar Jfor the same, of a gear to impart movement to thethread-bar, a member having a bore to receive the hub of the gear andhaving also an enlarged recess rearward ot the bore there being ashoulder at the rear terminus oi the bore, the hub having a rearthreaded extremity, a collar adjustable upon the hub within the recess,arms extending from the gear-carrying member and lying longitudinally ofthe boxing, means to secure one of the arms to the boxing, and a drivingmember to engage and drive the gear.

2. In a coal drill the combination with an internally threaded boxingand a threadbar therein, of a tubular member of a single section havingan arm to engage the boxing and also having an internal shoulder, meansto secure the arm to the boxing, a gear to drive the thread-bar its hublying within the member, and means on said hub to engage the shoulder ofthe said member, said means being adjustable on said hub and adapted toretain the gear in place.

3. In a coal drill the combination with an internally threaded boxingand a thread-bar therein, ot a tubular member of a single section havingan arm to engage the boxing, means carried by one of the last namedparts to secure the arm to the boxing, said tubular member having ashoulder whose tace is disposed in a plane substantially perpendicularto the axis of the bore, a gear to drive the thread-bar, its hub lyingwithin the member, and means carried by and adjustable on the hubrelative to the said shoulder and adapted for retaining the gear inplace.

4. In a coal drill the combination with an internally threaded boxingand a thread,- bar, of a tubular member of a single section having anarm to extend longitudinally of and engage the same, means carried bythe arm to secure it to the boxing, a gear to drive the thread-bar andhaving a hub to lie within the member, the same having a threadedextremity, a collar adjustable on said extremity to retain the gear inplace, a stud carried by the tubular member', and

Va pinion thereon to engage and drive the gear. t

5. In a coal drill the combination with an internally threaded boxing,and a threadbar therein, of a tubular member, a gear -having a hubrevoluble within the member and adapted for driving the thread-bar,means adjustable on the gear to retain it in said member, arms on themember lying longitudinally of the boxing, a member secured to andcarried by one of the last name portions, and means on one of saidportions with which it engages to secure the tubular member rigidrelative to the boxing.

6. The combination with a coal drill boxing and a member having a bore,the parts adapted to be rigidly associated,V of a gear adapted to seatagainst one end of the member and having a hub to it the bore of thesame, said member having a second larger bore, and an adjustable collaron the rear end of the hub adapted to lie in said second bore andadapted to bear upon the shoulder created between the two said bores.

In testimony whereof I aii'ix my signature, in presence of twowitnesses.Y

WILLIAM H, CLARKSON. Witnesses:

L. M. THURLow, ELUIDE JEssIE CLARKSON.

Copies of this patent may be obtained for ve cents each, by addressinglche Commissioner of Patents, Washington, D. C.

